Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flow from operating activities:
Net earnings	$ 323,648	$ 354,664
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	233,543	192,865
Amortization of deferred policy acquisition costs	13,931	10,421
Amortization of debt issuance costs	1,765	1,512
Interest credited to policyholders	11,028	10,484
Change in allowance for losses on trade receivables	34	(9)
Change in allowance for inventory reserves	800	(603)
Net gain on sale of real and personal property	(28,258)	(78,805)
Net (gain) loss on sale of investments	(4,645)	(3,022)
Deferred income tax	114,724	27,259
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	(8,102)	13,618
Inventories	(2,674)	(2,107)
Prepaid expenses	46,248	71,813
Capitalization of deferred policy acquisition costs	(14,360)	(15,636)
Other assets	(8,695)	16,794
Related party assets	5,195	57,767
Accounts payable and accrued expenses	45,162	59,525
Policy benefits and losses, claims and loss expenses payable	16,922	11,702
Other policyholders' funds and liabilities	1,563	2,684
Deferred income	5,034	2,339
Related party liabilities	232	(97)
Net cash provided by operating activities	753,095	733,168
Cash flow from investing activities:
Property, plant and equipment	(761,277)	(720,265)
Short term investments	(409,925)	(249,082)
Fixed maturities investments	(168,817)	(169,899)
Equity securities	(489)	(1,315)
Preferred stock		(3)
Real estate	(15,788)	(23)
Mortgage loans	(136,682)	(86,361)
Proceeds from sale of:
Property, plant and equipment	310,409	379,198
Short term investments	386,508	243,634
Fixed maturities investments	120,525	89,085
Equity securities		808
Preferred stock	2,651
Real estate	831
Mortgage loans	105,731	29,895
Net cash used by investing activities	(566,323)	(484,328)
Cash flow from financing activities:
Borrowings from credit facilities	331,787	461,735
Principal repayments on credit facilities	(158,479)	(187,958)
Debt issuance costs	(2,085)	(5,957)
Capital lease payments	(83,414)	(77,786)
Employee Stock Ownership Plan	(4,653)	(1,484)
Securitization deposits	245	298
Common stock dividends paid	(19,586)	(19,594)
Investment contract deposits	130,166	140,220
Investment contract withdrawals	(49,555)	(25,974)
Net cash provided by (used in) financing activities	144,426	283,500
Effects of exchange rate on cash	(10,517)	(12,543)
Increase (decrease) in cash and cash equivalents	320,681	519,797
Cash and cash equivalents at the beginning of period	600,646	441,850
Cash and cash equivalents at the end of the period	$ 921,327	$ 961,647